Railway-traffic-controlling apparatus.



P. J. ACKERMAN.

RAILWAY TRAFFIC CONTROLLING APPARATUS. APPLICATION FILED 1330.1.1913. I

Patented Mar. 16, 1915.

' 2 SHEETS-SHEET 1.

Q? Q Q WPHJQ WBTNESSES BNVENTQH Q a. x

Q; K iwwa THE NORRA.) Hum; 00. PHOTO-LITHO., WASHINGTON D, C.

F. J. AOKEEMAN.

RAILWAY TRAFFIC CONTROLLING APPARATUS.

APPLICATION FILED DEO.1, 1913.

Patented Mar. 16, 1915.

2 SHEETS-SHEET 2. A

R n N A w M W m m 2 V w A M W W m A A 4 5 L B A m E E N 0 A G H w E m zA m a A. m U 1 7 a W W N m I NHL 0 Vfl N \W FIG. 2

/NSULATION 7 Z MAGNET/2,451.5

WITN ESS ES Fl G 3 PERMANENT MAG/vs 7- THE NORRIS PETERS C0"PHOTC-LITHO.. WA-SHINGTON, D C,

UNITED STATES PATENT OFFTQE.

FRANK J. ACKERMAN, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO THE UNIONSWITCH & SIGNAL COMPANY, OF SYVISSVALE, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

RAILWAY-TRAFFIC CONTROLLING APPARATUS.

Specification of Letters Patent.

Patented Mar. 16, 1915.

Original application filed. November 11, 1912, Serial No. 730,543.Divided and this application filed December To all whom it may concern.

Be it known that I, FRANK J ACKERMAN, a citizen of the United States,residing at Pittsburgh, in the county of Allegheny and State ofPennsylvanimhave invented certain new and useful Improvements inRailway- Traffic-Controlling Apparatus, of which the following is aspecification.

My invention relates to railway traliic controlling apparatus.

The present application is a division of my copending application filedNov. 11, 1912, Serial No. 730,5d3, for railway traffic controllingapparatus.

1 will describe one form of apparatus embodying my invention and willthen point out the novel features thereof in claims.

In the accompanying drawings, Figure 1 is diagrammatic view showing oneform of apparatus and circuits embodying my invention. Fig. 2 is a viewshowing in end elevation one form of circuit controlling deviceshowndiagrammatically in Fig. 1. Fig. 3 is a sectional view on the lineIII- III of Fig. 2.

Similar reference characters refer to simi lar parts in each of theseveral views.

Referring first to Fig. 1, A designates a trailic controlling device,here shown as being a railway switch, which is actuated by an electricmotor I) through the medium of a suitable actuating mechanism F. Pdesignates power mains comprising wires 11 and 12, which mains aresupplied with current from a source 10, here shown as being a battery,and from which mains current is supplied to the motor D by means of asuitable operating circuit. This operating circuit is controlleddirectly by a circuit controlling device G, located preferably adjacentthe switch A. This circuit controlling device is governed by a controlcircuit which includes contacts operated by a manually operated lever C,usually one of a plurality of levers of an interlocking machine, asexplained in my co-pending application of which the present applicationis a division. 1

The switch operating mechanism F which I have here shown may be brieflydescribed as follows: Operatively connected with the Serial No. 803,925.

armature 13 of motor D is a screw 15 which coacts with a longitudinallymovable nut 16. This nut is rigidly connected with a plate 18 providedwith a cam slot 20, which latter coacts with a roller or stud 17: thisroller or stud drives a bar 19 connected with the movable rails ofswitch A. Theplate 18 carries four cams 30, 31, 54, and 57, whichactuate respectively circuit controlling contacts 32, 83, 52 and 58 forpurposes hereinafter explained.

The lever C, as here shown, is of a usual and well known type comprisingan oscillating shaft which operates contacts 21, 22, 25 and 26. Thecontacts 21 and 22 constitute a pole-changer for reversing the directionof current in the circuit controlling device G as hereinafter explained.The movements of the shaft 70 are governed by return indication devicesK and K each of which comprises a segment 27 mounted rigidly upon theshaft 70 and provided with a dog 28 which engages with a latch 29operatively connected with the armature of an electromagnet N or B. Eachof these electromagnets is provided with a separate indication circuitextending from the lever (J to the switch A, which circuits are tracedin detail hereinafter. The contacts 25 and 26, which serve to controlthe circuits of indication magnets R and N, are not moved during thefirst portion of the movement of the shaft 70 up to the point at whichit is stopped by the dogs 28 but during the remainder of the movement ofthe shaft the contacts 25 and 26 are reversed in position. Thisoperation of contacts 25 and 26 is obtained, as here shown, by mountingthe contacts loosely on the shaft 70, and by moving them by pins 78, 74,and 76 carried by disks 71 and 72 fastened to the shaft 70.

Referring now to Figs. 2 and 3, the circuit controlling device Grcomprises a polarized relay having magnets 77 and 77, and a neutralrelay having magnets 85 and 85*. The cores of these magnets are allmounted in front and back plates 84 and 7 9 of non magnetizablematerial. The magnet cores of the polarized relay are connected by asoft iron back-strap 87 interposed between the back plate 79 and themagnet spools;

and the magnet cores of the neutral relay are similarly connected by asoft iron backstrap 88 interposed between the front plate 84 and themagnet spools. The magnet cores of the polarized'relay are provided withpole-pieces 80 and 80 which are mounted on the cores and are held inplace by nuts 128 and 129. A polarized armature 82 is pivotally mountedon a pin 83 carried in a soft iron head, and is adapted to oscillatebetween the pole-pieces 80 and 80. The mat r 8 is polarized. in, yuitable manner; as here shown this polarization is accomplished by meansof a permanent magnet. 91 mounted in the plates 84 and 79. and passingthrough the head 90. The back strap87 extends downwardly and surroundsthe permanent magnet 91 as shown in Fig. 3. The permanent magnet 91 andhead 90 are held in place by nuts 92 and 93 screwed upon the threadedends of the permanent magnet 91. Mounted upon the upper end of.armature82 is a bracket 94 0f insulating material which carries contactfingers 95 and 96. These fingers are riveted in slots in suitable blocks97 and 98 secured to the bracket 94 by screws 99. The upper ends ofthesefingers cooperate with contacts 100, 101, 102 and 103 which aremounted in a suitable block 104 of insulating material carried byupwardly reaching arms of front plate 84. It will be seen that when thearmature 82 rests against pole-piece 80 (the position shown in Fig. 2),fingers 95 and 96 engage respectively with contacts 101 and 103; andthat when the armature 82 is reversed in position so that it restsagainst pole-piece 80, fingers 95 and 96 will engage respectively withcontacts 100 and 102. Contact fingers 95 and 96 are electricallyconnected, by means of wires 132 and 133 respectively, with terminalposts 134 and 135 which are mounted in a block 136 of insulatingmaterial carried on arms 137 projecting forwardly from front plate 84.Secured: to the armature 82 is an upwardly extending locking segment 34,the upper edgeof which is provided with a dog 35 by'n eans of which thearmature may be mechanically locked in either of its extreme positions,that is, against either of the polepieces 80 or 80, as hereinafterexplained.

The magnets 85 and 85 of the neutral relay are provided with pole-pieces36 (only one of which is shown) located at the OPPO- site end of themagnet from the pole-pieces 80 and 80 ofthe polarized relay. Thesepole-pieces 36 act upon a neutral armature 37 carried on the verticalarm of a bent lever 38, which lever is pivoted at 39 to suitable arms 44extending upwardly from the back plate Mounted upon thislever 38 bymeans of insulating studs 46 is a contact finger 45 the lower end-ofwhich co-acts with a contact block 47 mounted on a block 48 ofinsulating material, which latter is secured to suitable lugs on theback plate 79. Con tact 45-47 is closed when the relay 85 85 isenergized and open when the relay is deenergized. A horizontalarm 150 oflever 38 extends along the top of the device and co-acts with the dog 35to control themovemerits of armature 82. This arm 150 is guided to movevertically by a suitable slot in a lug 140 formed on the upper edge ofthe front plate 84. WVhen relay 85 is deenergized, th v 1. .9 by grav tyin the bottom of the slot in lug 140 and on one side or the other of thedog 35, so that the armature 82 is. thenlocked in whichever position itoccupies. But. when the relay 85 is energized, thereby attractingarmature 37, the arm. 150 is raised sufieiently to allow dog 35; to passunder it, and the polarized armature 82 may then be reversed.

The. permanent. magnet 91 is provided with a winding 89. for the purposeof maintaining and reinforcing 171161111X of this magnet. This windingmay be energized at times in a manner which will hereinafter appear.

Referring. again to Fig. 1, the control circuit for the windings ofpolarized relay 77-:77 is as. follows-from positive main 11 through wire40, contact 21, Wire 42, windings 77 and 77, wire 106, contact 45-. 47,wire 41, contact. 22, wire 43, to negative main 12. It will be seen thatthis circuit includes contact 45 which is operated by the neutral magnet8585 and that there fore this circuit is closed only when the neutralmagnet is. energized; It will be seen also that this control circuitincludes the pole-changing contacts 21 and 22, and that, therefore, whenthe lever C is reversed in position, and contact 45 is closed, thedirection of current through the polarized relay windings will bereversed;

The windings 85 and 85 of the neutral relay are connected in series, andare provided with terminals 50 and 51. One of these terminals 50 isconnected withcontrol wire 41, and the other terminal 51 isconnectedwith either the positive or the negative power main 11 or 12 bycontacts 52 and 53. WVhen contact 53 is closed, as shown in the drawing,this terminal 51 is connected with the negative main 12 throughresistance 116, contact 53 and wires 111 and 59. When the switch A isreversed in position so that contact 53 is open and contact 52is closed,the terminal 51 will be connected with the positive main 11 throughresistance 114, contact 52 and wires 58 and 109. It will be seen,therefore, that relay 8585 will be energized or not according as its twoterminals are connected with power mains of different polarity or withthe same power main.

InF-ig. 1 I have shown the switch A in what I shall herein term itssition, and the other parts of the apparatus in the positionscorresponding to this position of the switch. With the parts in suchpositions, both terminals 50 and 51 of neutral relay 85-85 are connectedwith the negativemain 12, hence this relay is deenergized and isconsuming no current; contact 45 is therefore open, so that the controlcircuit for the polarized relay is open and this relay is thereforeconsuming no current. When it is desired to move switch A to its otherposition, which I will herein term the reverse position, the shaft oflever C is rotated in the direction of the arrow until the dog 28 ofindication device K engages latch 29. This movement reverses theposition of polechanging contacts 21 and 22, thereby connecting wires 41and normal po- 42 with the positive and negative mains 11 and 12respectively. Terminal 50 of neutral relay 8585 being connected withwire 41, is now connected with the positive main 11; and since the otherterminal 51 of this relay is connected with the negative main 12,current now flows through windings 85 and 85 so that the neutral relayis energized thereby raising the arm 150 out of the path of dog 35 andclosing contact 45. The closing of contact 45 closes the circuit throughthe windings of polarized relay 7 7, and since the pole changingcontacts 21 and 22 are reversed, the current flowing through thepolarized relay is now in such direction as to reverse the position ofarmature 82. The reversal of armature 82 reverses contacts 95 and 96, sothat operating current is supplied to the motor D through the followingcircuitfrom positive main 11 through wire 60, winding 89, wire 62, contact 95, wire 65, motor armature 13, wire 66, contact 96, wire 67,contact 33, wire 68 and 69, motor field winding 14, wire 59 to negativemain 12. This current passes through winding 89 in such direction as toreinforce the flux of the permanent magnet 91, thereby assuring that theflux of this magnet shall be maintained. Winding 89 is preferably of lowresistance so that it will not greatly reduce the motor current. Themotor D is operated by this current in such direction as to actuate themechanism F to move switch A to the reverse position. As soon as themotor has moved the plate 18 a short distance, contact 52 is closed, sothat terminal 51 of the neutral relay is then connected with both thepositive and negative power mains through contacts 52 and 53respectively, but this does not de'energize the neutral relay 85. Acircuit is then closed from positive main 11 through wires 109 and 58,contact 52, resistance 114, resistance 116, contact 53, and wires 111and 59 to negative main 12, but the current in this circuit is smallowing to resistances 114 and Both terminals of the 116 hence thiscircuit does no harm. When the movement of the switch A to the reverseposition has been completed and the switch rails have been locked by theend portion of cam slot 20, contact 33 is reversed in position by dog31, thereby opening the motor operating circuit; at the same timecontact 53 is reversed by dog 57, thereby disconnecting terminal 51 fromthe negative main 12 and leaving it connected only with the positivemain 11 through contact 52.

neutral relay windings are then connected with the positive main 11, sothat no current flows through these windings and the relay thereforeopens. Lever 38 falls, thereby locking polarized armature 82 in theposition which it now occupies, and opening contact 45 which opens thecontrol circuit of the polarized relay so that this relay then becomesdeenergized. It will be seen, therefore, that as soon as a movement ofthe switch has been completed, the consumption of current by thecontrolling device G ceases. The reversal of contact 33 closes anindication circuit through magnet R as follows-from positive power main11 through wires 109 and 110, contact 33, wire 107, contact 25, wire 55,magnet R and wire 56, to negative power main 12. Current in this circuitenergizes magnet R which raises its armature, thereby raising latch 29out of the path of dog 28, so that the movement of the lever C may thenbe continued to the end of the stroke. 'During this last portion of themovement of lever C, contact 25 is re versed, thereby opening thecircuit of magnet R, and contact 26 is also reversed thereby closing atthat point the circuit for magnet N, so that the circuit for this magnetmay be closed at the switch after the latter has again been moved to itsnormal position.

The movement of switch A from its reverse position to its normalposition would be similar to that just described. For such movement thedirection of the control current through the polarized relay winding isagain reversed by contacts 21 and 22, and contacts 95 and 96 are thenmoved back to the position shown in the drawing. A motor operatingcircuit is then closed through motor D as follows: From positive powermain 11 through wire 60, winding 89, wires 62 and 64, contact 96, wire66, motor armature 13, wire 65, contact 95, wire 112, contact 32, wires113 and 69, field winding 14, wire 59 to negative power main 12. Thiscurrent passes through armature 13 in the opposite direction to thathereinbefore described, so that the motor then operates in the properdirection to move the switch A to its normal position. After suchmovement has been completed, indication magnet N is energized in amanner similar to that hereinhefore explainedrfor magnet It, andthemovement of the lever be completed.

Onev important feature. of switch control? ling-apparatus and circuitsembodying. my invention; isthat no. current is consumed by the apparatusexcept when the switch is being moved. But in spite of this, ifthelever. 38 be raised by hand and the polarizedarmature 82 shifted toenergize the motorto move the switch to the position opposite to tlratcorresponding to control lever; G, then when the parts are left tothemselves the circuit controlling. device will automatically operatetobringthe switch back to the position corresponding to the position ofthe control lever. For example, with the parts in the positions showninllig. 1, if lever 38 is raised byhand and thearmature 82 shifted tothe opposite po-v si tion, contacts 95 and 96 will close the motorcircuit and the switch will be moved towardthe reverse position. Ifafter. the switch operating mechanism has been moved. far enough toclose contact 52, the parts are left to themselves, the neutral relay85-85 will be energized because its terminal 50 is connect-ed withnegative: main 12 andrits. other terminal 51 is then con- ,nectedwithpositive main 11. 'Hence armature. 8-2 will be unlocked and thedirection of current through the polarized winding is. such that thisarmature will be returned to. the position shown in the drawing, therebyshifting contacts 95 and 96 to cause the motor to return the switch tothe normal posltlon. V

Although I have herein shown and described only a t'ew forms andarrangements of apparatus. and circuits embodying my invention, it isunderstood that various changes and modifications may be made thereinwithin the scope of the appended claims without departing from thespirit and scope of my invention.

Having thus described my invention, what I. claim is:

1. In combination, a railway traflic con trolling device, anelectromagnetic device responsive to reversals of current forcontrolling the said traffic controlling device, a source of current, apair connected with said electromagnetic device, a pole-changer forreversibly connecting said conductors with the source, a contactincluded in one of said conductors, a second electromagnetic devicecontrolling said contact, one of the terminals of said secondelectromagnetic device being connected with one of said conductors, andmeans controlled by the trafiic controlling device for connecting theother terminal of the second electromagnetic device with one pole or theother of the source, the two said terminals being connected with the;same pole when.

U can then the position of the.

of conductors thetraflic controllingdevice;and. the polechanger occupycorresponding positions whereby atsuclrtimes.neither of. said elec--.tromagnetic-. devices; is consuming. current In combination, a railwaytrain-c controlling. device, an electromagnetic. device IQSPOHSlVGntOreversals of current for controlling thesaid traflic. controllingdevice,

a source: of current, conductors. connected:

source, a contact included in one of. said.

conductors, and means controlled by the traflic controlling device foropening said contact when the trailic con-trollingv device. and thepole-changer occupy corresponding positions whereby at suclrtiines nocurrent is consumed. V

L'In combination, a railway traffic controlling device, a source ofcurrent,.a polarized relay comprising an armature, con tacts andconnections controlled .by said armature for controlling the trailiccontrolling device;

with the w-lnding ofthe said'arelay, a polechanger for reversiblyconnecting said conductors with the source, a neutral relay a contact ofwhich is lncluded 1n one of the said conductors,,one.oi the. terminalsof said a pair of conductors connected 7 neutral relay being connectedwith one of 7 said conductors, contacts and connections operated by thetraflic controlling device for connecting the other neutral relayterminal with one pole or the other of the said source, the saidterminals being connected with the same pole when the trafiiccontrolling device and the pole-changer occupy corresponding positions.

5. In combination, a railway traflic controlling device, a motor foractuating it in reverse directions, a sourceof current, a polarizedrelay comprising an armature, contacts and connections controlled bysaid armature for supplying current from said source to the motor tocause the latter to operate in one direction orthe other according tothe position ofthe armature; a pair of conductors connectedwith thewinding of said relay, a pole-changer for reversibly connecting saidconductorsv with the source, a magnet, an armature controlled therebyand adapted to lock the polarized relay armature in either of itscontrol positions, one terminal of the magnet being connected with oneof said conductors, contacts and connections operated by the trafiiccontrolling device for connecting the other terminal of the magnet withone pole or the other of the source, the said magnet terminals beingconnected with the same pole when the trafiic controlling device and thepolechanger occupy corresponding positions.

6. In combination, a railway traiiic con trolling device, a motor foractuating it in reverse directions, a source of current, a polarizedrelay comprising a permanent magnet and a polarized armature, contactsand connections controlled by the said armature for supplying currentfrom the'source to the motor to cause the latter to operate in onedirection or the other according to the position of said armature, aneutral relay, means for supplying current to the winding of saidneutral relay; a circuit for the winding of the polarized relayincluding the source of current, a pole-changer and a con tact of theneutral relay; and a winding for the permanent magnet for maintainingthe flux therein, said last-mentioned winding bein included in circuitwith the motor.

I. In combination, a railway trafiic controlling device, a polarizedrelay comprising an armature, contacts and connections controlled bysaid armature for controlling the traflic controlling device, a sourceof current, a circuit for the winding of said relay including the sourceof current, a polechanger for reversing the connection of the saidwinding with the source, a magnet, an armature controlled by the magnetand adapted to lock the polarized relay armature in either of itscontrol positions, one terminal of said magnet being connected with thesaid circuit between the polarized relay winding and thepole-changer,and contacts and conductors controlled by the traiiiccontrolling device forconnecting the other terminal of the magnet withone pole or the other of the source according to the position occupiedby the trafiic controlling device, the two said terminals beingconnected with the same pole of the source when the traflic controllingdevice and the pole-changer occupy corresponding positions.

8. In combination, a railway traffic-controlling device, electromagneticmeans responsive to reversals of current for controlling said device, asource of current, a pair of conductors connected with saidelectromagnetic means, a pole-changer for reversi= bly connecting saidconductors with the source, a relay, a contact of which is in cluded inone of said conductors, one terminal of said relay being connected withone of said conductors, contacts and conductors controlled by thetrafiic controlling device for connecting the other terminal of thereling said device,

the other of the source according to the position occupied by thetraific controlling device, the two said relay terminals being connectedwith the same pole of the source when the traffic controlling device andthe pole-changer occupy corresponding positions.

9. In combination, a railway trailic controlling device, electromagneticmeans responsive to reversals of current for controlling said device, asource of current, a pair of conductors connected with saidelectromagnetic means, a pole-changer for reversibly connecting saidconductors with the source, a magnet, an armature controlled by themagnet and adapted to lock the electromagnetic means, one terminal ofsaid magnet being connected with one of said c0nductors, contacts andconductors controlled by the trailic controlling device for connectingthe other terminal of the magnet with one pole or the other of thesource according to the position occupied by the device, the two saidterminals being connected with the same pole of the source when the saiddevice and the pole-changer occupy corresponding positions.

10. In combination, a railway traffic controlling device,electromagnetic means responsive to reversals of current forcontrolacircuit for said means including a source of current and a polechanger,and a circuit controller-adapted to control said circuit and governed bysaid traflic controlling device and by said polechanger. v 1

11. In combination, an electromagnetic device responsive to reversals ofcurrent and including a permanent magnet, a railway traflic controllingdevice controlled by said electromagnetic device, a circuit for saidelectromagnetic device including a source of current and a pole-changer,a circuit controller adapted to control said circuit and governed bysaid railway trafiic controlling device, and a winding for the permanentmagnet, said winding being also controlled by the electromagneticdevice.

12. In combination, a railway traffic controlling device,electromagnetic means for governing said device, a circuit for thecontrol of said means, a relay adapted to control said circuit and toalso lock said electromagnetic means, and a circuit for said relaygoverned by said traflic controlling device.

13. In combination, a railway traflic controlling device, anelectromagnetic device responsive to reversals of current forcontrolling said traffic controlling device, a pair of conductorsconnected with said electromagnetic device, a source of current, a polechanger for reversibly connecting said con ductors with said source, arelay for controlling said electromagnetic device, one termilay with onepole or Cir n a'l of said relay being connected with one of saidconductors, and means controlled by said traihc controlling device forconnecting the other terminal of said relay with one pole or the otherof said source.

14:. In combination, a railwaytrallic controlling device, anelectromagnetic device responsive to reversals of current forcontrolling saidtraflic controlling device, a pair of conductorsconnected with said electromagnetic device, a source of current, apolecha'nger for reversibly connecting said conductors with said source,relay for controlling the circuit of saidelectromagn'etic de vice" andfor mechanically locking the' movable member of said electromagneticdevice, one terminal of said relay being connected with one of saidconductors, vand means controlled by said trailic controlling device forconnecting the other'termin'al of said relay with one pole orthc otherofsaid source;

15. In combination, an electromagnetic device responsive to reversals ofcurrent, a railway traffic controlling device controlled thereby, acircuit for said electromagnetic device including a source of currentand a pole-changer, a contact included in said circuit, and meanscontrolled by said polechanger and by said trai'fic controlling devicefor causing's'aid contactto' be open or closed according as saidpole-changer and said traffic controlling device do or do not occupycorresponding positions.

16. In combination, anelectromagnetic device responsive to reversals" ofcurrent, a railway trailic controlling device controlled thereby, acircuit for said electromagnetic device including a source of currentand a pol'e changer, and means controlled by said pole-changer and bysaid trafiic controlling device for opening or closing said'circuitaccording as saidpole-clianger and said traific controlling device do ordo not occupy cor- V responding positions;

1'7. In combination, an electromagnetic device" responsive to reversals01 current, a railway trafiic controlling device controlledthereby, asource ofcurrent, a pole-changer for reversibly connecting said sourcewith said electromagnetic device, and means for disconnecting saidsource from or connect ing it-With said electromagnetic-deviceaccording; as the pole-changer and the traflic controlling device do ordo not occupy corresponding positions.

Copies of this patent may be obtainedfor five cents 18. In combination,an electromagnetic device responsive to reversals of current, a railwaytraffic controlling device controlled thereby, a circuit for saidelectromagnetic device including a source of current and" apole-changer, and means for deenergizing or energizing saidelectromagnetic device according as the polerchanger and trafficcontrolling device do or do not occupy corresponding positions.

19. In combination, an electromagnetic device responsive to reversals ofcurrent, a railway traffic contro'lling' device controlled thereby, asource of current,"a pairoi conductors connected with said"electromagnetic device, a pole-changer fo'r reversibly connecting" said"source with said conductors, a relay having a front contact included inone oi" said conductors one terminal of said relay being connected withone of said conductors; means controlled by said trai'lic controllingdevice for connecting the other relay termi nal with one pole or theother of said source the relay terminals being connected with same poleof thesou'rce when" the electromag neticdevice' and the pole-changeroccupy cor responding positions.

20. In combination, an electromagnetic device,- a railway trailiccontrollingdevice controlled thereby, a circuit for the controlof theelectromagnetic device, a relay'ior controlling said circuit and formechanically locking the movable member of said electromagnetic device,and a circuit for therel'ay controlledby said tiaflic controllingdevice.

21. In combination, an'electromagnetic'device responsive" to reversalsof current, a railway trafiic controlling device controlled thereby, asource of current, means for re'- versibly connecting said" source withsaid electromagnetic device, and meanscontrolled by the traiiiccontrolling device and'by the current reversing means for controllingthe supply of current from said source to said electromagnetic devicewhereby the elcctroa magnetic device is deenergized whensaid trafli'ccontrolling'device and tliecurrent' reversing means ,occupycorresponding positions. V

In testimony whereof I a'lhx my'signature' in presence of two Witnesses;

FRANK J. AGKERMAN. Witnesses V. H. Racnann, F. W. Errs.

each; by addressing the commissioner of Patents;

Washington, 1:; c.

